  import {mapGetters} from 'vuex'
  export default {
    computed: {
      ...mapGetters('m_cart', ['total']),
    },
    watch:{
     total(){
        this.setBadge()
     }
    },
    methods:{
      setBadge(){
        uni.setTabBarBadge({
          index:2,
          text:this.total+''
        })
      }
    },
    onShow(){
    this.setBadge()
    }
  }